Speed-regulating apparatus



V. A. FYNN.

SPEED REGULATING APPARATUS.

APPLICATION FILED mAY27. I918.

1,350,446. a nted Aug. 24, 1920.

ATTORNEY.

UNITED STATES PATENT OFFICE.

VALERE A. FYNN, OFST. LOUIS, MISSOURI, ASSIGNOR TO WAGNER ELECTRIC MANU. FAOTURING COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

SPEED-REGULATING APPARATUS.

Specification of Letters Patent.

Patented Aug. 24, 1920.

Application filed May 27, 1918. Serial No. 236,821.

To all whom it may concern:

.certain new and useful Speed-Regulating Apparatus, of which the following is such a "full, clear, and exact description as will enable any one skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawin s, forming part of this specification.

y invention relates to means for regulating or adjusting the speed of prime movers, such as internal combustion engines.

In carrying out my invention, Imake use of a dynamo electric machine, both members of which are capable of rotation. I connect one of these members to the engine shaft and the other to the throttle or valve of the engine, produce in the member connected to the engine a magnetic field revolving with respect to any point of said member, in a direction opposed to that in which said member revolves when driven by the engine and provide that member which is connected to the throttle, with a windin inductively responsive to the magnetic eld produced in or from the member connected to the engine. Since themember connected to the engine revolves in a direction opposed to that in which the field produced in that member rotates with respect to said member,it follows that when the speed of the field equals the speed of the revolving member, said field will remain stationary in space, and will produce no inductive effect on the cooperating member connected to the throttle. When the speed of the field exceeds the speed of the member driven from the engine, then the member connected to the throttle will be impelled in the direction of rotation of the 4 ing use'of said field for the purpose of controlling the speed of a prime mover, through its thottle valve or the like.

My invention will be better understood by reference to the accompanying drawing, in which Figure 1 shows one embodiment of my invention and Fig. 2 indicates how the throttle controlling member can be connected to the throttle.

The invention is shown as applied to an internal combustion engine connected to a direct'current generator 3, 4, by way of the shaft 2. This generator is adapted to supply translating devices 11, and to cooperate with a storage battery 5, controlled by a suitably designed switch 6. The generator 3, 4, is connected to a direct current motor provided with a shunt winding 8 which can be regulated by means of the adjustable resistance 10, a series winding 9, and an armature 7, the winding on which is connected to a commutator and to the slip rings 13, 14, 15. The throttle actuating device comprises a shaft 20 driven from the engine, which carries an armature 19 provided with a polyphase winding 21 connected to the slip rings 16, 17, 18. The slip rings 13, 14, 15 are connected by waycof stationary brushes to the slip rings 16, 17 18. The member 22 cooperating with the armature 19 carries a squirrel cage winding,

23 and has a nose 25 which is normally held against the stop 24 by means of the spring 26. The levers 27, 28 connect the movable member 22 to the throttle valve 29 located within the intake pipe 30. When the nose 25 on the member 22 rests against the stop 24, the throttle 29 is wide open. The dynamo electric machine 7, 8, 9, may be described as a rotary converter being driven by direct current derived from the generator 3, 4, or the battery 5 and generating polyphase currents made available at the slip rings 13, 14, 15. This machine is preferably so designed that when operating as an ordinary direct current motor, its speed the armature 19 is at rest.

the armature 19 will revolve in a counterclockwisedirection as seen in Fig. 2, while the rotating field produced by the polyphase currents derived from the rotary converter will revolve in a clockwise direction when Under full load conditions, the speed of the armature 19 should be a little greater than the speed of .the polyphase revolving field, the difference being just sufiicient'to balance the torque produced by the spring 26 without, however, moving the nose 25 of the element 22 away from the stop 24:. Should the load diminish, then the speed of the engine will of course increase and might momentarily increase the voltage of the generator 3, 4, but such changes in that voltage will not afiect the speed of the rotary converter and the speed of the polyphase revolving field produced in the armature" 19 will remain the same, with the result that a stronger torque due to the greater difierence in speed between 19 and 22, will be immediately exerted on the member 22 in a counterclockwise direction, thus moving the throttle 29 toward closed position and reducing the engine speed. While the relative movement .22. F or this reason, it will be possible with this device to keep the engine speed within very close limits while the load varies over its whole range. The change in the engine speed can be further reduced with varying load, by causing the speed of the converter to change with the load on the engine. This can readily be achieved, for instance, by

means of the series winding 9. If the converter speed is caused to increase with increasing engine load, then the variations in the engine speed will be reduced. It is possible to so regulate the speed of the converter as to keep the engine speed absolutely constant, or even to cause same to increase with increasing engine load.

The fact that the impedance of the armature 19 is the higher, the smaller the speed difference between the field produced by the polyphase currents and the armature 22 it self tends to make the speed regulation closer by causing the converter to run at a higher speed when the torque exerted on the throttle is small than when said torque is at its maximum.

The valve can also be normally held closed by the spring 26 in which case the armature 19 would be driven in a clockwise direction as seen in Fig. 2 and the field produced by the polyphase currents be caused to revolve counterclockwise. Under these conditions a decrease in the speed of the engine would tend to open the throttle.

Having fully described my invention, what I claim as new and desire to secure by Letters Patent of the United States is:

1. In speed regulating apparatus, the

combination of a device to be regulated,

speed controlling means therefor, a dynamo electric machine having both members movable, one member being connected to the I speed controlling means and the other driven at a speed proportional to that of the device to be regulated, and means for producing in said last named member a magnetic field revolving with respect to said member in a direction opposed to the direction of rotation of said member.

2. In speed regulating apparatus, the com- "bina tion of a device to be regulated, speed controlling means therefor, a dynamo electric machine having both members movable,

one member being connected to the speed controlling means and the other driven at a speed proportional to that of the device to be regulated, a shortcircuited winding on the first member, and means for producing in said last named .member a magnetic field revolving with respect to said member in a direction opposed to the direction of rotation of said member.

3. In speed regulating apparatus, the combination of a device to be regulated, speed controlling means therefor, a dynamo electric machine having both members movable, one member being connected to the speed controlling means and the other driven at a speed proportional to that-of the device to be regulated, and a source of alternating current connected to the last named member to produce therein a magnetic field revolving with respect to said member in a. direction opposed to the direction of rotation of said member.

4'. In speed regulating apparatus for prime movers, the combination of speed controlling means therefor, a dynamo electric machine having both members movable,

one member being connected to the speed controlling means and'the other driven at a speed proportional to that of the prime mover, a generator driven by the prime mover, a rotary converter in circuit with said generator, means for varying the speed of the converter in response to variations in load on the prime mover, and means connecting the alternating current side of the converter with one member of the dynamo electric machine to produce therein a magnetic field revolving with respect to said member in a direction opposedto the direction of rotation of said member.

' 5. In speed regulating apparatus for prime movers, the combination of speed controlling means therefor, a dynamo electric spect to said member in a direction opposed machine having both members movable one member being connected to the speed controlling means and the other driven at a speed proportional to that of the prime mover, a generator driven by the prime mover, a rotary converter in circuit with said generator, means for varying the excitation of the converter in response to variation in the load on the prime mover, and means connecting the alternating current side of the converter with one member of the dynamo electric machine to produce therein a magnetic field revolving with reto the direction of rotation of said member. 6. In speed regulating apparatus for prime movers, the combination of speed controlling means therefor, a dynamo electric machine having both members movable one member "being connected to the s eed controlling means and the other driven at a speedy proportional to that of the prime mover, a generator driven by the prime mover, a rotary converter in circuit with said generator, and means connecting the alternating current side of the converter with one member of the dynamo electric machineto produce therein a magnetic field revolving with respect to said member in a' direction opposed to the direction of rotation of said member.

In testimony whereof, I have hereunto set my hand and affixed my seal.

VALERE A. FYNN. [L. 5.] 

